| 摘要 |
A device for determining the actual reversal of the direction of rotation of a rotational drive continuing to operate after previous switching of the direction of rotation, in particular for window lifting systems or sliding roof drives in a motor vehicle, has a sensor wheel ( 1 ) with a coding structure ( 9 ) configured asymmetrically in respect of distribution along the periphery of the sensor wheel ( 1 ); a single detector ( 2 ), which generates a rotor speed-dependent pulse signal during rotation of the sensor wheel ( 1 ) by scanning the coding structure ( 9 ); and an evaluation unit ( 4 ), to which the pulse signal is fed and which determines the actual reversal of the direction of rotation by evaluating the pulse edges; wherein the coding structure ( 9 ) is formed by coding sectors ( 10 ) of a first sector width ( 11 ) and a reference coding sector pair ( 12 ) with a second sector width ( 13 ). |
